NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,779 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

stage 0 melanoma
(... MEH-luh-NOH-muh)
Abnormal melanocytes (cells that make melanin, the pigment that gives skin its color) are found in the epidermis (outer layer of the skin). These abnormal melanocytes may become cancer and spread into nearby normal tissue. Also called melanoma in situ.

EnlargeStage 0 melanoma in situ; drawing shows skin anatomy with an abnormal area on the surface of the skin. Both normal and abnormal melanocytes and melanin are shown in the epidermis (outer layer of the skin). Also shown are the dermis (inner layer of the skin) and the subcutaneous tissue below the dermis.

Stage 0 melanoma in situ. Abnormal melanocytes are in the epidermis (outer layer of the skin).